In a large mixing bowl combine the flour. salt, baking powder, and sugar.
Mix the dry ingredients together well.
Add the softened butter and gently mix together.
Slowly pour about 1/4th to 1/2 cup of water in at a time and knead as you pour. Keep doing this until the ingredients combine into a ball of dough that isn't overly sticky.
In a large frying pan, heat the vegetable oil on medium heat.
Roll dough into about 2 inch sized balls.
When they're semi-smooth, pat them flat until they're about an inch or so thick.
Put on a plate and cut two slits on top with a sharp knife.
Repeat these steps until all of the dough is gone.
Use a pair of tongs to place 5-6 dumplings in the hot oil.
Fry on each side for about 3-5 minutes or until golden brown. This will vary based on how hot your oil in the pan is.
Line a plate with a paper towel and place the finished fried dumplings on it as you take them out of the oil.
Repeat these steps until all of the dumplings are fried.